Welcome Jodiyogi - huge congratulations on almost 1 month quit, that is great, hope you have a nice treat lined up for it

Yes, lack of concentration is perfectly normal at this stage of your quit as you are in the thick of your brain re-wiring and body healing Nozmo's likely to be right about the circulation improving that may leave your hands and feet feeling like that but if symptoms persist maybe a visit to your doctor or chemist might be worthwhile just for assurance.

I promise, things will improve but need to be patient as it a gradual healing process, lots of water, bit of exercise daily and guard up at all times.

Post anytime, we all have been there, looking forward to reading your progress